[PATCH v2 0/9] perf python: Follow-up fixes and shell test deflaking

[Ian Rogers <irogers@google.com>]

This series contains follow-up fixes for the standalone Python scripts
and their shell tests, particularly when running 'perf test' as root
under heavy parallel load:

- Clamp sample_id size calculation for PERF_RECORD_KSYMBOL,
  PERF_RECORD_BPF_EVENT, and PERF_RECORD_TEXT_POKE records to work
  around kernels without "perf/core: Restore header fields in sideband
  output callbacks" [1].
- Fix offline interval printing in sctop.py and live signal races in
  stat-cpi.py.
- Deflake Intel PT, failed-syscalls, and other Python shell tests under
  parallel 'perf test' load by scoping tracepoint checks to
  'perf list tracepoint', passing '-B -N --no-bpf-event' to 'perf record',
  and avoiding unnecessary system-wide ('-a') recordings.
- Default event_analyzing_sample.py to an in-memory SQLite database
  (':memory:') when '--db' is not specified.
- Initialize perf debug output ('perf_debug_setup()') when loading the
  'perf' Python extension module.
- Fix races in 'perf list' ('perf_pmus__print_pmu_events()' and
  'tp_pmu.c') when concurrent tests dynamically create and remove
  kprobe/uprobes tracepoints.

v2:
- Fix 8-byte alignment calculation for PERF_RECORD_TEXT_POKE payload in
  evsel__event_size() by aligning fixed + old_len + new_len.
- Keep offline interval clock advancing on all samples in sctop.py while
  flushing any remaining syscalls at EOF.
- Use 'mktemp -d' private directories in test_sctop_python.sh and
  test_failed_syscalls_python.sh so temporary files are not unlinked and
  recreated directly in /tmp.
- Explicitly include <stdlib.h> in tools/perf/util/pmus.c.

[1] https://lore.kernel.org/r/20260929014206.4175245-1-irogers@google.com

Ian Rogers (9):
  perf evsel: Clamp sample_id size for ksymbol, bpf, and text_poke
    events
  perf python sctop: Fix offline interval printing and test flakiness
  perf python stat-cpi: Fix live mode signal races and test flakiness
  perf test: Deflake Intel PT Python shell tests under load
  perf test: Deflake failed-syscalls Python shell tests under load
  perf test: Reduce overhead and contention in Python shell tests
  perf python event_analyzing_sample: Default to in-memory SQLite
    database
  perf python: Initialize debug output on module load
  perf pmu: Fix race with concurrent tracepoint creation and removal in
    perf list

 tools/perf/python/event_analyzing_sample.py   | 35 +++-------
 tools/perf/python/sctop.py                    |  7 +-
 tools/perf/python/stat-cpi.py                 | 19 +++---
 .../shell/test_check_perf_trace_python.sh     |  8 ++-
 .../shell/test_compaction_times_python.sh     |  8 ++-
 .../test_event_analyzing_sample_python.sh     | 11 ++-
 .../shell/test_export_to_postgresql_python.sh | 49 +++++++------
 .../shell/test_export_to_sqlite_python.sh     | 50 ++++++++------
 .../test_failed_syscalls_by_pid_python.sh     | 68 +++++++++++--------
 .../shell/test_failed_syscalls_python.sh      | 54 +++++++++------
 .../tests/shell/test_flamegraph_python.sh     |  5 +-
 .../shell/test_futex_contention_python.sh     |  7 +-
 tools/perf/tests/shell/test_gecko_python.sh   |  3 +-
 .../shell/test_intel_pt_events_python.sh      | 43 ++++++------
 .../tests/shell/test_mem_phys_addr_python.sh  |  8 ++-
 .../shell/test_net_dropmonitor_python.sh      |  9 +--
 .../tests/shell/test_netdev_times_python.sh   |  6 +-
 .../tests/shell/test_powerpc_hcalls_python.sh |  4 +-
 .../tests/shell/test_rw_by_file_python.sh     |  5 +-
 .../perf/tests/shell/test_rw_by_pid_python.sh |  4 +-
 tools/perf/tests/shell/test_rwtop_python.sh   |  4 +-
 .../shell/test_sched_migration_python.sh      |  4 +-
 tools/perf/tests/shell/test_sctop_python.sh   | 58 ++++++++--------
 .../tests/shell/test_stackcollapse_python.sh  |  2 +-
 .../perf/tests/shell/test_stat_cpi_python.sh  | 12 +++-
 .../test_syscall_counts_by_pid_python.sh      |  6 +-
 .../tests/shell/test_syscall_counts_python.sh |  5 +-
 tools/perf/tests/shell/test_task_analyzer.sh  |  3 +-
 .../tests/shell/test_wakeup_latency_python.sh |  7 +-
 tools/perf/util/debug.c                       |  2 +-
 tools/perf/util/evlist.c                      |  6 +-
 tools/perf/util/evsel.c                       | 59 +++++++++++++++-
 tools/perf/util/evsel.h                       |  1 +
 tools/perf/util/pmus.c                        | 21 ++++--
 tools/perf/util/python.c                      |  1 +
 tools/perf/util/tp_pmu.c                      |  8 ++-
 36 files changed, 366 insertions(+), 236 deletions(-)

-- 
2.56.0.rc1.315.gc6ed9934b7-goog